#973 Randomvar Segfault

[Richard]

I am attempting to use a randomvar in a model, like so:

class evcharger_rand {
        randomvar work_dist;
}

object evcharger_rand{
        mileage_classification 73;
        name evcharger_det_0;
        parent evcharger_house_0;
        work_dist "type:weibull(0.5,0.5); min:0.0; max:1.0; refresh:1h;";
}

where evcharger_rand is some of my own custom code.

Running this model results in a segfault in random.c at Line 1301 when var->update_rate tries to deference var, whose address at this point is 0x4052400000000000.

Tracing the issue back, it seems as though var->next on Line 1336 should be yielding a NULL but isn't.

Therefore, I investigated randomvar_create() at Line 1259. And found that it was called only once and that var->next at that time was NULL.

Looking in convert_to_randomvar(), I found that var->next was 0x4052400000000000 when this function was called.

My conclusion is that var->next is getting altered sometime between the calls to randomvar_create() and convert_to_randomvar().

[Richard]

(Note: my custom code is not making such a change to my knowledge. It simply tries to observe the value of the randomvar.)